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Pentair UltraTemp 250 Pool & Spa Heater

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Efficiently heat your pool for comfortable temperatures year-round with the ETi 250. With quick heat-up times and the durable TitanTough™ Direct-Fire Titanium, the toughest heat exchanger material, effectively warm up your pool. A great replacement for the MasterTemp High-Performance Heater, with the same plumbing alignments to effectively serve your backyard oasis needs.

Product Description

Say goodbye to those after-pool shivers and hello to a cozy and warm backyard spa.

  • Up to 96% thermal efficiency*. For every $1 of natural gas that’s piped into the heater, up to 96 cents go directly to heating your pool, ensuring optimal heating.
  • The TitanTough™ Direct-Fire Titanium Heat Exchanger is resistant to corrosion and is the toughest heat exchanger ever built—for years of high-quality, trustworthy warmth.
  • A variety of installation features, including multiple orientation options for gas line connection and easy-access keypad positioning.
  • The ETi 250 is 250,000 BTUs (BTU is the quantity of heat needed to raise one pound of water by one degree Fahrenheit). The higher the BTUs, the higher the heating power, and the faster your pool can heat up.

*The ETi 400 is 96% efficient. The ETi 250 is 94% efficient when operated on natural gas and is 96% efficient when operated on propane with available conversion kit. 

Three factors to consider when choosing a heater

Size of heater

Pool heaters and heat pumps are sized based on their heating capacity, measured in British Thermal Units (BTUs). A BTU measures how much energy is required to heat 1 gallon of water by 1F. Most heat pumps can deliver between 100,000 – 150,000 BTUs depending on their size and most gas pool heaters are between 175,000 – 400,000 BTUs.

Geographic location, availability of gas, and electricity costs

Heat pumps generally thrive in areas with mild to warm climates where electricity costs and low to moderate. Gas heaters aren’t heavily impacted by environmental conditions and can be a great option in cooler climates where gas prices are low to moderate.

Size and features of your pool

The size of your pool may dictate which system you need. We recommend working with your pool professional to identify the right pool heater for your backyard oasis. Thanks to its identical plumbing alignment, the ETi 250 is an ideal drop-in replacement for MasterTemp and Max-E-Therm heaters.

ETi 400 and ETi 250 both offer years of high quality, trustworthy corrosion resistance and easy venting to warm your pool efficiently. The compact ETi 250 shares all the robust features of its larger counterpart. That’s why the convenient size of the ETi 250 make it an ideal upgrade from the MasterTemp® High Performance Heater.

Size Comparison

Eti250 Dimensions

At Discount Pool Heating, we pride ourselves on matching the best product to our customer’s needs. Our prices are so competitive, we can’t even advertise them! For the best price, contact us directly!

Additional Info



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